How many chill hours does 97107 get?

97107 averages 1607 chill hours per winter, ranging from 1242 to 2089 across the last 10 years.

What hardiness zone is 97107?

97107 is in USDA hardiness zone 9a.

Location almanac

The short answer

97107 averages 1,607 chill hours per winter (1,242–2,089 across 10 years) in USDA zone 9a.

97107 climate
Average chill hours	1,607 (1,242–2,089 across 10 winters)
USDA hardiness zone	9a
Last spring frost	typically January 31 – April 14
First fall frost	typically November 29 – December 25

Computed from 10 winters of ERA5 hourly temperature (Open-Meteo, 2015–2025); zones from USDA PHZM 2023. Data updated July 3, 2026. See methodology.

Every variety in our database, checked against 97107’s chill hours and zone:

Chill and zone requirements are comfortably met in 97107.

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How many chill hours does 97107 get?: 97107 averages 1607 chill hours per winter, ranging from 1242 to 2089 across the last 10 years.
What hardiness zone is 97107?: 97107 is in USDA hardiness zone 9a.

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[1] Open-Meteo / Copernicus ERA5. Historical Weather API (hourly 2m temperature) — accessed July 2026
[2] USDA / PRISM (Oregon State University). 2023 USDA Plant Hardiness Zone Map — accessed July 2026